WIP : Laravel Validator Implementation

[AurelGit]

No description provided.

[moufmouf]

We need to do some more work on the GraphQLite internals before merging this.

The @Validate annotation is hooked on the FieldMiddleware and therefore, cannot be used in Factories.

We should instead hook on the ParameterMapper, but the ParameterMapperInterface does not allow a "middleware" style parameter passing, so we cannot do a validation process (either return an error or delegate value processing to the next ParameterMapper. I need to refactor the ParameterMapper concept in order to allow validation of parameters.

[moufmouf]

Almost done. I still need to write the documentation and we are good to go!

[AurelGit]

It may be intersting to add a unit test for a multiple rule, for example :

* @Validate(for="bar", rule="gt:42|lt:100")